Metatron is an angel mentioned
in Hebrew apocalyptic literature and frequently referred to as "the
Prince of the countenance." In the Talmud
he is described as being seated next to Elisha b. Abuyah, as having "a
name like that of his master," and even, in some manuscripts as "the
lesser YHWH." He is to be identified with jahoel, mentioned in the
Apocalypse of Abraham, who was responsible for the highest tasks
in heaven and performed many ascribed to the Archangel Michael. Simultaneously
he is associated with Enoch who walked with
God (Genesis 5:22).

The Kabbalaists noted his name in Hebrew
could be spelled with either seven letters or six letters. The seven-letter
Metatron was identified with the supreme emanation from the Shekhinah, while
the six-letter with Enoch. A.G.H.

Source:

Bowker, John, The Oxford Dictionary of World Religions,
New York, Oxford University Press, 1997, p. 658